Add ref-count on RenderViewHost for each new RenderFrameProxyHost.

content/browser/frame_host/render_frame_proxy_host.h

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef CONTENT_BROWSER_FRAME_HOST_RENDER_FRAME_PROXY_HOST_H_
 #define CONTENT_BROWSER_FRAME_HOST_RENDER_FRAME_PROXY_HOST_H_
 
 #include "base/memory/scoped_ptr.h"
 #include "content/browser/frame_host/render_frame_host_impl.h"
 #include "content/browser/site_instance_impl.h"
@@ skipping 42 matching lines @@
 // forward. It also instructs the RenderFrameHost to run the unload event
 // handler and is kept alive for the duration. Once the event handling is
 // complete, the RenderFrameHost is deleted.
 class RenderFrameProxyHost
     : public IPC::Listener,
       public IPC::Sender {
  public:
   static RenderFrameProxyHost* FromID(int process_id, int routing_id);
 
   RenderFrameProxyHost(SiteInstance* site_instance,
+                       RenderViewHostImpl* render_view_host,
                        FrameTreeNode* frame_tree_node);
   ~RenderFrameProxyHost() override;
 
   RenderProcessHost* GetProcess() {
     return process_;
   }
 
   // Initializes the object and creates the RenderFrameProxy in the process
   // for the SiteInstance.
   bool InitRenderFrameProxy();
@@ skipping 69 matching lines @@
   // When a RenderFrameHost is in a different process from its parent in the
   // frame tree, this class connects its associated RenderWidgetHostView
   // to this RenderFrameProxyHost, which corresponds to the same frame in the
   // parent's renderer process.
   scoped_ptr<CrossProcessFrameConnector> cross_process_frame_connector_;
 
   // TODO(nasko): This can be removed once we don't have a swapped out state on
   // RenderFrameHosts. See https://crbug.com/357747.
   scoped_ptr<RenderFrameHostImpl> render_frame_host_;
 
+  // The RenderViewHost that this RenderFrameProxyHost is associated with. It is
+  // kept alive as long as any RenderFrameHosts or RenderFrameProxyHosts
+  // are associated with it.
+  RenderViewHostImpl* render_view_host_;
+
   DISALLOW_COPY_AND_ASSIGN(RenderFrameProxyHost);
 };
 
 }  // namespace
 
 #endif  // CONTENT_BROWSER_FRAME_HOST_RENDER_FRAME_PROXY_HOST_H_